Did you get to check on that little kitty? I personally would not feel guilty if I picked up an animal and it turned out to be someone's pet. 1st, what was it doing wondering around? (I do not believe in allowing your pets to roam free) And 2nd, I would look for the owner so if it had one, maybe they would be just as grateful to find the kitty sooner rather than later. Of course I have to admit that picking up a stray off the street only happened to me one time, so maybe I would think differently at the time. Either way, I hope that it is OK.